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cells and systems vocabulary
cells and systems
69
Science
8th Grade
09/01/2016

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Term
organisms
Definition
an individual animal, plant, or single celled life form
Term
nutrients
Definition
a substance that provides nourishment essential for growth and the maintenance of life
Term
metabolism
Definition
the chemical processes that occur within a living organism in order to maintain life
Term
stimulus
Definition
a thing or event that evokes a specific functional reaction in an organ or tissue
Term
response
Definition
Organisms reaction to a stimulus
Term
structures
Definition
Parts of an organism that performs specific tasks
Term
function
Definition
Purpose or task
Term
organ
Definition
group of tissues that work together to perform a specific function
Term
Organ system
Definition
Group of organs that work together to perform a certain task, such as digestion or breathing
Term
capillaries
Definition
Tiny blood vessels that connect arteries to veins; one cell layer thick and extremely narrow
Term
Compound Light Microscope
Definition
Microscope that has 2 or more lenses and has a light source
Term
cells
Definition
The basic unit of life
Term
tissues
Definition
Group of similar cells working together to perform a specific function
Term
Cell membrane
Definition
thin structure that encloses all the contents of plant and animal cells
Term
Cell wall
Definition
Outer covering of a cell that provides strength and support
Term
cytoplasm
Definition
Contents of the cell inside the cell membrane excluding the nucleus
Term
vacuoles
Definition
organelles that store water and other substances required by the other cell
Term
organelles
Definition
Structures in cells that perform A certain function
Term
nucleus
Definition
Organelles that directs all the activities into a cell
Term
Mitochondria
Definition
Organelles that convert energy the cell receives into a form it can use
Term
chloroplasts
Definition
They are solar panels that converts the suns energy into food for the cell
Term
multicellular
Definition
Made of more then one cell
Term
unicellular
Definition
Made of just one cell
Term
Micro-organisms
Definition
Usually unicellular organisms that can only be seen through a microscope
Term
Amoeba
Definition
1.a single-celled animal that catches food and moves about by extending finger like projections of protoplasm. Amoebas are either free-living in damp environments or parasitic
Term
Paramecium
Definition
a single-celled freshwater animal that has a characteristic slipper like shape and is covered with cilia
Term
Cilia
Definition
minute hairlike organelles, identical in structure to flagella, that line the surfaces of certain cells and beat in rhythmic waves, providing locomotion to ciliate protozoans and moving liquids along internal epithelial tissue in animals.
Term
Diffusion
Definition
the spreading of something more widely
Term
Selectively permeable
Definition
Cell membrane allows certain substances through while others cannot
Term
osmosis
Definition
a process by which molecules of a solvent tend to pass through a semipermeable membrane from a less concentrated solution into a more concentrated one, thus equalizing the concentrations on each side of the membrane
Term
Specialized cells
Definition
Specialized cells are cells that have gone on to specialize in being in a certain part of the body, such as a skin cell.
Term
Red blood cells
Definition
The blood cells that carry oxygen
Term
Mechanical Digestion
Definition
mechanical digestion is this process of breakdown of solid food into tiny pieces which takes place inside the mouth that can be swallowed and then get ready for further processing through chemicals and enzymes in the stomach
Term
Chemical digestion
Definition
It's the chemical breakdown of food into simpler compounds. Proteins are broken down to amino acids, carbohydrates are broken down to simple sugars, and fats are broken down to fatty acids and glycerol
Term
Enzymes
Definition
a substance produced by a living organism that acts as a catalyst to bring about a specific biochemical reaction
Term
peristalsis
Definition
the progressive wave of contraction and relaxation of a tubular muscular system, especially the alimentary canal, by which the contents are forced through the system
Term
Gastric juices
Definition
a thin, clear, virtually colorless acidic fluid secreted by the stomach glands and active in promoting digestion
Term
villi
Definition
one of the minute, wormlike processes on certain membranes, especially on the mucous membrane of the small intestine, where they serve in absorbing nutriment.
Term
Microvilli
Definition
Any of the minute hairlike structures projecting from the exposed surface of the cell in order to increase the surface area for absorption, secretion, cellular adhesion, or mechanotransduction
Term
diaphragm
Definition
a device for varying the effective aperture of the lens in a camera or other optical system.
Term
Bronchi
Definition
plural form of bronchus
Term
Bronchioles
Definition
any of the minute branches into which a bronchus divides
Term
Alveoli
Definition
a small cavity, pit, or hollow, in particular
Term
Atria
Definition
Of atrium
Term
ventricles
Definition
a small cavity, pit, or hollow, in particular
Term
Arteries
Definition
any of the muscular-walled tubes forming part of the circulation system by which blood (mainly that which has been oxygenated) is conveyed from the heart to all parts of the body.
Term
Veins
Definition
any of the tubes forming part of the blood circulation system of the body, carrying in most cases oxygen-depleted blood toward the heart.
Term
White blood cells
Definition
One of the cells the body makes to help fight infections
Term
platelets
Definition
Platelets, also called thrombocytes, are a component of blood whose function is to stop bleeding by clumping and clotting blood vessel injuries.
Term
urea
Definition
a colorless crystalline compound that is the main nitrogenous breakdown product of protein metabolism in mammals and is excreted in urine
Term
nephrons
Definition
each of the functional units in the kidney, consisting of a glomerulus and its associated tubule, through which the glomerular filtrate passes before emerging as urine
Term
dialysis
Definition
the separation of particles in a liquid on the basis of differences in their ability to pass through a membrane
Term
Nervous tissue
Definition
A type of animal tissue comprised principally of nerve cells and neuroglia cells
Term
neurons
Definition
a specialized cell transmitting nerve impulses; a nerve cell
Term
dendites
Definition
a short branched extension of a nerve cell, along which impulses received from other cells at synapses are transmitted to the cell body
Term
axon
Definition
the long threadlike part of a nerve cell along which impulses are conducted from the cell body to other cells
Term
Central nervous system
Definition
the complex of nerve tissues that controls the activities of the body. In vertebrates it comprises the brain and spinal cord
Term
Peripheral nervous system
Definition
the nervous system outside the brain and spinal cord
Term
Somatic nervous system
Definition
the part of the nervous system that serves the sense organs and muscles of the body wall and limbs, and brings about voluntary muscle activity
Term
Astronomic nervous system
Definition
the part of the nervous system responsible for control of the bodily functions not consciously directed, such as breathing, the heartbeat, and digestive processes
Term
Small pox
Definition
an acute contagious viral disease, with fever and pustules usually leaving permanent scars
Term
vaccine
Definition
a substance used to stimulate the production of antibodies and provide immunity against one or several diseases, prepared from the causative agent of a disease, its products, or a synthetic substitute, treated to act as an antigen without inducing the disease
Term
tar
Definition
1.a dark, thick, flammable liquid distilled from wood or coal, consisting of a mixture of hydrocarbons, resins, alcohols, and other compounds. It is used in road making and for coating and preserving timber
Term
Carbon monoxide
Definition
a colorless, odorless toxic flammable gas formed by incomplete combustion of carbon
Term
nicotine
Definition
a toxic colorless or yellowish oily liquid that is the chief active constituent of tobacco. It acts as a stimulant in small doses, but in larger amounts blocks the action of autonomic nerve and skeletal muscle cells. Nicotine is also used in insecticides
Term
bronchitis
Definition
inflammation of the mucous membrane in the bronchial tubes. It typically causes bronchospasm and coughing
Term
emphysema
Definition
a condition in which the air sacs of the lungs are damaged and enlarged, causing breathlessness
Term
lung cancer
Definition
carcinoma of the lungs; one of the commonest forms of cancer
Term
ulcer
Definition
an open sore on an external or internal surface of the body, caused by a break in the skin or mucous membrane that fails to heal
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